package com.sl.springboot.utils;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.sl.springboot.entity.User;
import com.sl.springboot.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;


@Component
public class TokenUtils {
    @Autowired
    private static UserMapper userMapper;
    public static String createToken(String userId, String sign) {
        return JWT.create().withAudience(userId).
                withExpiresAt(DateUtil.offsetHour(new Date(),2)).
                sign(Algorithm.HMAC256(sign));
    }
    public static User getCurrentUser() {
        try{
            HttpServletRequest request=((ServletRequestAttributes) RequestContextHolder
                    .getRequestAttributes()).getRequest();
            String token=request.getHeader("token");
            if(StrUtil.isNotBlank(token)){
                String userId = JWT.decode(token).getAudience().get(0);
                return userMapper.selectById(Integer.valueOf(userId));
            }
        }catch(Exception e){
            return null;
        }
        return null;
    }

}